Lines at right angles
The lines are said to be at right angles if the rotating half line (or ray) from starting from initial position to the final position describes one quarter of a circl..
Introduction to Right Angled Triangle
Introduction - When calculating sides or angles of right angled triangles, it is easiest to use the appropriate trigonometric relation. Finding the value of trigonometric ratios from the tables is learnt easily. Nowadays of course calculators are able to give accurate ..
Solution of Right Angled Triangles
When calculating sides or angles of right angled triangles , it is easiest to use the appropriate trigonometric relation. Finding the value of trigonometric ratios from the tables is learnt easily. Nowadays of course calculators are able to give accurate values..
Measurement of Angles
To measure an angle we shall use two kinds of units, the degree unit and the radian unit. A degree(Sexagesimal system) is defined to be an angle formed by half-line (or a ray) rotated about its end point (1/360) of a complete revolution. Typ..
Problems on Lines Angles - Test Questions-i
Question 11 - Question: In the given figure, each of the angles AOC and AOB are right angles. Show that BOC is a line. Answer: =180 o Since the sum of angles formed by them is 180 o , BOC is a line..
Question 11 - Question: In the given figure, each of the angles AOC and AOB are right angles. Show that BOC is a line. Answer: =180 o Since the sum of angles formed by them is 180 o , BOC is a line..Problems on Right angle Triangles - Test Questions-i
Similarly, In right angled triangle BOA, Multiplying by 2, we get From (i) and (ii..
Similarly, In right angled triangle BOA, Multiplying by 2, we get From (i) and (ii..Obtuse angle
An angle whose measure is more than one right angle and less than two right angles (i.e., less than 180 o and more than 90 o ) is called an obtuse angle..
An angle whose measure is more than one right angle and less than two right angles (i.e., less than 180 o and more than 90 o ) is called an obtuse angle..Acute angle
An angle whose measure is less then one right angle (i.e., less than 90 o ), is called an acute angle..
An angle whose measure is less then one right angle (i.e., less than 90 o ), is called an acute angle..Angles at a Point
A Corollary is an easy consequence of a theorem. It two lines intersect, then the vertically opposite angles so formed are equal, and When a number of lines meet at a point, the sum of the angles so formed is four right angles..
A Corollary is an easy consequence of a theorem. It two lines intersect, then the vertically opposite angles so formed are equal, and When a number of lines meet at a point, the sum of the angles so formed is four right angles..What kind of angle is ∠ABC?
What kind of angle is ∠ ABC? => right angle or obtuse angle or acute angle or straight angle..
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